21. For more information, please send an e-mail, ______ you can also include your advice to us.
| A．when | B．where | C．which | D．that |
相关试题
The problems, _____ properly, will seriously affect the relations of nations.
| A．not solved | B．if not s olving |
C．if not solved | D．if not to solve |
The biggest problem was that thousands of travelers remained _____ outside because of the floods.
| A．sticking | B．stuck | C．to be stuck | D．to have stuck |
We noticed that each animal and each tree in the park _____ being taken good care of.
| A．are | B．is | C．were | D．was |
Part of the reason Charles Dickens loved his own novel, David Copperfield, was _____ it was rather closely modeled on his own life.
| A．what | B．that | C．why | D．whether |
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